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Its really no problem autoXing on 18's. I do it all the time on my GT3's and they hold up just fine. Yes, you will be able to handle more efficient with 17" wheels with the same tire as on the 18", but 18" is still okay. Now 19" on the other hand is too much!

Its really no problem autoXing on 18's. I do it all the time on my GT3's and they hold up just fine. Yes, you will be able to handle more efficient with 17" wheels with the same tire as on the 18", but 18" is still okay. Now 19" on the other hand is too much!

its not the size that I was really making a point about, but rather that it is 18" CHROME, which is probably pretty heavy.

Why are 17s better than 18s for the track? Other than a negligible circumference difference, wouldn't the 18s (at the same or lower rim and tire total weight) exceed the maximum performance of 17s? Me thinks so, with the lower profile providing additional grip.

Well, first off, I am talking about non M e46 only. I am not completely sure who is right and who is wrong with this, but I would think (and have heard) that 17 is the ideal size for weight and side wall on tires allowing flex but not too much.

So, the disagreement is whether a lower profile with give more or less grip. Anyone care to share?

While were on the topic, does anyone know why all the vettes have 17" front wheels and 18" rear wheels? Is that just for looks or does it make a difference?